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grade 109 high strength bolt din 6914 for structural steelwork bridges and wind towers-0

Bolt

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Grade 10.9 High-Strength Bolt DIN 6914 for Structural Steelwork, Bridges, and Wind Towers

Heavy-Duty Structural Integrity | Optimized for Preloaded Large-Diameter Connections

  • Overview
  • Key Features
  • Technical Specifications
  • Materials & Surface Finish
  • Applications
  • Customization Options
  • Company Strengths (Pyramid Hardware Fasteners)
  • FAQ
  • Contact Information
  • Recommended Products

The Pyramid Hardware High-Strength Bolt (DIN 6914 / EN 14399) is engineered for the world's most demanding structural projects. These are not standard fasteners; they are specialized structural bolts designed for preloaded joints in steel buildings, bridges, and industrial towers. Manufactured from high-grade alloy steel and heat-treated to Class 10.9, our DIN 6914 bolts feature a larger head (across flats) than standard hex bolts to distribute the massive clamping forces required in structural engineering. Produced in Egypt at our IATF 16949 certified facility, these bolts are paired with DIN 6915 nuts and DIN 6916 washers to form a certified high-strength structural bolting assembly (HV sets).

Key Features

Large-Series Hex Head:

  • Designed specifically to handle the high tightening torques and surface pressures found in steel-to-steel construction.

Preloading Capacity:

  • Engineered for use in friction-grip (slip-critical) connections where the bolt's clamping force, not the shank's shear strength, carries the load.

Grade 10.9 Alloy Steel:

  • Provides the ultimate balance of tensile strength and ductility required for seismic and wind-loaded structures.

Environmental Protection:

  • Standard with Hot-Dip Galvanizing (HDG) or Geomet coating to ensure 25-50+ year lifespans in outdoor infrastructure.

Full Traceability:

  • Every bolt is marked with the property class and manufacturer ID for critical safety audits.

Technical Specifications

Parameter

Details

Standard

DIN 6914 / EN 14399-4 (HV Sets)

Diameter Range

M12, M16, M20, M22, M24, M27, M30, M36

Property Class

10.9 (Standard) / 8.8 (Option)

Head Style

Heavy Hex Structural Head

Thread Type

Metric Coarse (Truncated for HDG allowance)

System Type

System HV (High-Strength Structural Bolting for Preloading)

Materials & Surface Finish

Alloy Steel (42CrMo or equivalent):

  • Precision-quenched and tempered for structural grade performance.

Surface Finishes:

Hot-Dip Galvanized (HDG):

  • To ISO 1461, the gold standard for structural steel protection.

Geomet 500 / Dacromet:

  • High-performance thin-film coatings for precision torque-tension control.

Sherardizing:

  • For extreme atmospheric and industrial pollution resistance.

Applications

Bridge Construction:

1. Structural joints in highway, railway, and pedestrian bridges.

High-Rise Buildings:

2. Primary steel frame connections in commercial and residential skyscrapers.

Industrial Warehouses:

3. Large-span portal frames and heavy racking systems.

Wind Energy:

4. Tower segment connections for onshore and offshore wind turbines.

Power Plants:

5. Structural supports for turbines, boilers, and cooling towers.

Airport Terminals:

6. Large-scale steel roof structures and hangar assemblies.

Customization Options

Feature

Available Customization

Pre-Lubricated Sets

Nuts pre-lubricated to ensure consistent K-factor during torqueing

Custom Lengths

Extra-long bolts for deep beam-to-column connections

Tension Control Bolts (TCB)

Production of "twist-off" style structural bolts (System HRC)

Direct Tension Indicators (DTI)

Supplied with DTI washers for visual preload verification

Company Strengths (Pyramid Hardware Fasteners)

15+ Years Structural Focus:

  • Specialized in high-tensile B2B fastener supply.

Egyptian Manufacturing:

  • Strategic location for European and African megaprojects.

Certifications:

  • ISO 9001:2015 & IATF 16949 certified; CE-marking capable.

Global Reach:

  • Exporting to 30+ countries with 98.5% OTD.

Capacity:

  • 50+ machines and 70+ varieties for high-volume supply.

Cost Advantage:

  • 15-30% savings via direct Egypt-based manufacturing.

Packing & Logistics

Ports:

  • Alexandria, Port Said, Damietta.

Incoterms:

  • FOB, CIF, CFR.

Packaging:

  • Steel drums or reinforced wooden crates for heavy structural weights.

FAQ

Do you supply the complete HV set (Bolt, Nut, 2 Washers)?

1. Yes, we recommend ordering as a complete set to ensure compatibility and certified performance.

What is the torque-tension relationship for your HDG bolts?

2. Our HDG structural bolts are produced with specific thread allowances to maintain consistent torque-tension results after galvanizing.

Are your bolts CE-marked?

3. We manufacture according to EN 14399 standards and can provide the necessary declarations for EU projects.

What is the MOQ for M36 bolts?

4. Generally 500 pieces, but we can discuss smaller quantities for specific project phases.

How do you ensure the 10.9 hardness?

5. Every batch undergoes automated heat treatment and 100% hardness testing at our in-house lab.

Contact Information

Company:

  • Pyramid Hardware Fasteners

Address:

  • 6th of October City, Giza, Egypt

Email:

[email protected]

Phone/WhatsApp:

  • +20-1555577497

Certifications:

  • ISO 9001:2015, IATF 16949

Logistics:

  • MOQ 500-1000 pcs | Sample 10-15 days | Bulk 15-25 days | SGS/BV/TÜV Accepted

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